Cant get SQL query in laravel 5.1

how can I get this query in laravel 5.1. I have model Menu, database menus. This query in SQL get results i want.

SELECT b.title FROM menus a, menus b WHERE a.id=b.parent_id 

Same thing I cant get for this query

SELECT m.* FROM menus m WHERE m.id in (select m2.parent_id from menus m2)

via Chebli Mohamed